Extension library-lamp



(No Model.) 2 Sheets-Sheet 2.

D. W. PARKER & L. F. GRISWOLD.

EXTENSION LIBRARY LAMP.

No. 285,063. Patented Sept. 18, 1883.

A Home y A STATES UNITE PATENT @FFMIE.

DEXTER PARKER AND LEwIs E. GRISWOLD, or MERIDEN, CONNECTICUT; SAID eRiswoLn ASSIGNOR To THE CHARLEs PARKER COMPANY, OF

SAME PLACE. 1

EXTENSION LIBRARY-LAMP.

SPECIFICATION forming part of Letters Patent No. 285,063, dated September 18, 1883.

Application filed June 14, 1883. (No model.) i

'To all whom it may concern:

Be it known that we, DEXTER XV. PARKER and LEWIS F. GRIswoLD, citizens of the United States, residing at Meriden, in the 5 county of New Haven and State of Connecticut, have invented certain new and useful Improvements in Extension Library-Lamps; and we do hereby declarethe following to be afull, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to letters or figures of reference marked thereon, which form a part of this 1 5 specification.

This invention relates to extension librarylamps; and it consists, partly, in the combination of a fixed tube or rodand a movable tube or rod sliding telescopically thereon with a clamp for locking the latter at any point or degree of extension and a spring which oper ates said clamp, as hereinafter set forth.

The said invention also consists in the combination of a movable globe or shade with a supplemental counterbalancing weight or spring operating independently of the spring,

whereby the lamp and the movable ,part of the fixture are suspended.

The said invention also consists in the at;

0 tachment of the globe or shaderand its counterbalancing weight or spring to the movable part of the extension-fixture, in order thatthe lamp and its globe or shade may be moved up and down together, although the latter may be raised and lowered independently.

The said invention also consists in certain improvements in the clamping devices for holding the globe, and in certain other improvements in details of construction and com- 0 bination hereinafter particularly set forth.

Heretofore chandeliers have been provided with telescopic extension-fixtures, clamping devices, and suspension-springs operating sub stantially as above stated; but chandeliers are 4 5 a different class of articles from library-lamps and are-differently used and applied. Library-lamps have been made extensible, and provided with counterbalance-weights; but they have never been used with telescopic'extension-tubes, clamping devices, and springs, as hereinafter described.

In the accompanying drawings, Figure 1 represents a vertical sectional view of an extension-lamp and its fixture embodying the pres ent invention. modified constructions hereinafter explained.

A. designates the canopy of an extensionlamp, having standards a a raised thereon, a drum, B, being journaled in said standards, and operated by an inclosed spring, 0. A be cord or chain, D, is wound around said drum in the direction opposite to that in which the spring exerts its tension, and extends downward through an opening in the bottom of said canopy to a clamping device, hereinafter described. A rod, E, fixed to said canopy and extending down therefrom, constitutes the upper part of the lamp-fixture, the lower part of said fixture consisting of a tube, F, which is adapted to slide telescopically upon said rod. The upper end of said tube is provided with a head, G, also surrounding said rod, and having within it a recess, G, one side of which is inclined to correspond to the inclination of a clamping-wedge, H, which tapers upward, and 7 5 to the upper end of which the chain 1) is at tached. The spring 0 draws said wedge against said inclined face and causes it to bind against said rod, thereby prerenting the further descent of tube F. To the lower end of this tube a lamp-harp, I, is attached by screwing or in any other convenient manner. The side bars of this harp are made straight, and have a bottom plate, J, attached to their lower ends. This bottom piece supports the lamp K. To allow said lamp to be freely raised. and lowered at wi1l,l employ a rod, L, which is attached at its upper end to the clamping-wedge aforesaid, and extends at its lower end through a central aperture in said bottom plate, below which a movable bottom tip, M,

is screwed upon it. By pulling this tip the operator causes the aforesaid wedge to release the tube F, which will then descend by its own gravity to the point desired, when the 5 tip M is released, and the spring C is thereby allowed to draw up said wedge, so as to clamp the movable tube and the fixed rod together Figs. 2, 3, and a represent 55 bolts.

2 eeieea again. Of course the upper part of the fixture may be tubular and the lower part solid, or both parts may be tubular. A counterbalance-weight may also be employed instead of the spring and drum but I prefer the latter.

To leave space for the lamp and avoid contact therewith, and also to make the fixture more attractive in appearance, the rod L is bent aside below the lower end of tube F and extends down parallel with one of the side bars of the lamp-harp. It is bent in again below the lamp to a point above the bottom tip, M, aforesaid. There the first bend above mentioned occurs a small loop or eye, Z, is formed, from which is hung the usual bellshaped reflector, N; \Vith this lamp I may use either a shade or a globe, as may be most desirable; or both may be dispensed with. A globe is a very desiable addition, however, and it is important to provide means for raising the same at will without raising the lamp or interfering with the devices, whereby the lamp and globe may be moved up and down together. For this purpose I provide the sides of the lamp-harp with outwardly-extending verticallyperforated lugs 0 0, one or more 011 each side, and extend down through said lugs, and parallel to the side bars of the harp, rods O,- which are headed at the top and screwthreaded at the bottom to receive nuts 0, which convert said rods into long fastening- The upper ends of these. rods pass through a ring, P, having substantially the construction of the ordinary shade-ring, and their lower ends pass through another ring, Q, which has a flaring shape from the bottom upward, and fits neatly against the outer edge of the bottom plate, hereinbefore described.

The globe It is held between this flaring lower ring and the bottom of the upper ring, P, which has a downwardly-extending circular flange, 1?, to prevent outward movement of the upper end of the globe on any side. This upper ring has two chains or cords, S, attached to it, which pass upward over pulleys T, and thence down to a counterbalanceweight, U. This weight surrounds the movable tube F, and moves freely up and down over the same, and these pulleys are attached to brackets or arms 8, rigidly connected to said movable tube or lower part of the fixture.

As the attachment of the globe and its con nected devices is wholly to the movable part of the extension-fixture, the drawing down of the latter or the raising thereof will cause the lamp and globe to correspondingly ascend or descend. It is often necessary, however, to raise the globe above the lamp in order to allow the removal of the chimney and the filling and lighting of the lamp, or for the purpose of illuminating the room more brilliantly. This is easily effected by means of the counterbalance weight hereinbefore described, which will aid the operators hand in moving the globe upward, and will hold it at any desired point. Of course a shade may be sub stituted for a globe, and a spring or springs may be used instead of the counterbalance weight.

Fig. 2 illustrates on a smaller scale a modi fication in which the lamp-shade V (a globe may be substituted therefor) is-secured to a shade-ring, o, attached to the harp I. The lamp and shade (or globe) of course rise or descend together, neither of them having any independent motion. The tube F, rod E, and the suspending, clamping, and releasing devices are the same in construction, arrangement, and operation as those already described.

Fig. 3 shows a modification in which the globe and its rings and rods are used to counterbalance the lamp-harp, lamp, &c., the suspension-chain S, which passes over fixed pulleys T, being attached at one end to the upper globe-ring, l and at the other end to a weight or other device connected to said harp. The rods 0, which, as before, clamp the rings 1 Q on the globe It, thus holding the latter, do not pass through any attachment of said harp. The globe and its clamping devices move freely up and down over.the latter.

Fig. l illustrates a modification which employs the upper and lower rings, I Q, for holding the globe and the rods 0 for clamping said rings against the same, but does not provide for automatically holding said globe above the lamp. In this modification the cords or chains S are attached to the lampharp at one end of each and to an ordinary counter-balance-weight, N, at the other end,

the pulleys T being attached to the canopy A, as in Fig. 3.

hen the cxtension-tubes, or tube and rod, are used, as hereinbefore described, of course any other form"of clamping device may be substituted for the wedge shown and described, provided it be capable of accomplishing the same result. \Vc do not wish to be confined to any particular kind of clamp, nor to the precise construction of devices shown in any part of our extension lamp-fixture.

Having thus described our invention, what we claim as new, and desire to secure by Let ters Patent, is

1. In an extension lamp-fixture, the fixed upper tube or rod thereof and the lower movable rod or tube thereof, in combination with a lamp-harp attached to said lower movable rod or tube, a globe and globe-holding de vices unconnected to said harp, but supported by said lower tube or rod, and a spring-actuated clamping device or devices,whereby said lower tube or rod is locked to said upper tube or rod at any point or degree of extension, substantially as set forth.

2. In an extension lamp-fixture, a movable lower part thereof and devices for holding the same at any desired point, in combina tion with lamp-harp suspended from said movable part, and a globe and globe-holding and globe counterbalancing devices which move up and down with said harp, but allow IIO the independent raising and lowering of said globe, substantially as set forth.

,3. In an extension lamp-fixture, the combination of a fixed upper rod or tube andmovable lower rod or tube with a lamp-harp secured to the latter, and a globe and cou11- terbalance-weight suspended over pulleys attached to said lower rod, said globe resting on an attachment of said harp, but being free therefrom, substantially as set forth.

4:. In combination with a lamp, a globeadapted and arranged to rise above said lamp without disturbing it, and a counterbalanceweight for said globe, substantially as set forth.

5. In OOIIIblDZLlJlOIIWlUIZt lamp-harp having perforated lugs in its sides, the rods O,wl1iel1 extend through said lugs, and the globe-holding rings P Q, which are drawn against the globe by the action of the nuts on the screw threaded ends of said rods, substantially as set forth.

In testimony whereof we affix our signatures in presence of two witnesses.

Witnesses G. E. STooKDER, Jr., RALPH A. PALMER. 

